Flex: Validating a checkbox using StringValidator

Thought this might help someone. I had a small task to add validation for a “terms and conditions” checkbox for a work project today and after researching a couple of ways to do that (easily), I found this clever trick.

Use the built-in Flex mx:StringValidator!

By pointing to the selected property of the checkbox component, then validating the length of its string value you can effectively validate a checkbox field without having to extend Validator and create your own customized component.

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<mx:StringValidator
id="validatorTermsAndConditions"
source="{chkTermsAndConditions}"
required="true"
property="selected"
maxLength="4"
requiredFieldError="You must agree to the Terms and Conditions."
tooLongError="You must agree to the Terms and Conditions."/>

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